Reducing mechanism.



Patented May 6, I902.

W. S; McKlNNEY.

REDUCING MECHANISM.

(Application filed July 213, 1901.)

2 Sheets-Sheet I.

(No Model.)

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Patented May 6, I902.

W. S. MCKINNEY.

REDUCING MECHANISM.

(Application filed July 26, 1901.)

2 Sheets-Sheet 2.

(No Model.)

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UNITED STATES PATENT OFFICE.

\VALTER SABIN MCKINNEY, OF CHICAGO, ILLINOIS.

REDUCING MECHANISM.

SPESIFZCATIEON forming part of Letters Patent No. 699,551, dated May 6,1902.

Application filed July 26, 1901.

To a, whom it; Nuty concern.-

Be it known that I, \IVALTER SABIN MCKIN-' NEY, a citizen of the UnitedStates, residing in the city of Chicago, county of Cook, and State ofIllinois, have invented a new and useful Improvement in ReducingMechanism, of which the following is a specification.

In various classes of machinery in which one moving part is employed toimpart motion to a second moving part it is frequently desirable thatthe character of motion of said second or driven part shall be differentfrom the character of motion of the first or driving part.

My present invention relates to reducing mechanism whereby the characterof motion of a driving part is exhibited in a modified form in a drivenpart of a machine; and the object of my invention is to produce a dwellor period of comparative rest in a reciprocatory part of the machinewhen driven from a part having a constant motion. I attain this objectby the mechanism illustrated in the accompanying drawings, in whichFigure 1 is a face view of the rocking arms and levers which embody theprinciple features of myinvention. Fig. 2 is a side View of the partsshown in Fig. 1. Fig. 3 is a sectional view taken on the line 3 3, Fig.2. Fig. 4 is an assembly view of the complete device, and Fig. 5 is adiagrammatic View illustrating the motion of the main parts.

Similar characters refer to similar parts throughout the several views.

In the drawings, a represents a bracket which is designed to he fixed toa stationary object and is provided with an extending arm or bracket 1),wherein is journaled the rock-shaft c. The rocking arm d, which is keyedto and operates said shaft 0, is pivotally connected at its freeextremity to the connecting-rod e by means of the pin f. Saidconnecting-rod is driven by means of the crank-pin g on the crankh, asshown in Fig. 4. The bracket 2' is also stationary and forms a bearingfor theshaft j, whereby the crank h is driven, and the parts are soconnected that the rotation of the crank j imparts a rocking motion tothe shaft 0. The arm 70, which is also keyed to and driven by therockshaft 0, is pivotally secured at its free extremity to the slidinglever on by means of Serial No. 69,802. (No model.)

the pivot pin or shaft n. Said lever m is slidingly mounted in the guide0, and by preference the contiguous bearing-surfaces of said lever andguide are cylindrical, as best shown in Fig. In order to permit theoscillation or rocking of the lever m, said.

manner as to travel in front of the graduated,

scale '10 for use in studying the character of the motion of said block3.

The operation of the mechanism will behest understood by referring tothe diagram Fig. 5, wherein G G represents the circular path of the ping, F F represents the path of the pin f, and C represents the locationof the rock-shaft c. The path of pin n is indicated by line N N, while Pindicates the position of the stud p. The circle G G is laid off intotwenty equal divisions numbered consecutively; but in or: der to avoidconfusion a single stroke in one direction only of the block 8 will beconsidered, which stroke will be accomplished by the movement of the ping from the point number 0 to point number 10. As the pins g and f areconnected by therod e the revolution of the pin Q will cause theswinging of the pin f through the are F F, the numbers 0 to 10 on saidare indicating the position of said pin f for each correspondingposition of the pin g. The rocking of the pin f and arm (Z istransmitted through the rockshaft 0 to the arm is, thereby causing thepin a n in said arm to swing through the are N N, whereon the successivepositions ofsaid pin a are indicated by the numbers 0 to 10. Now theaxis of the guide 0 of the le- This increase in distance of its stroke.

causes the lever m to be drawn downward in the guide 0 when approachingthe extremities of the are N N. As a result the lateral motion of thepin 1' may be arrested for a considerable period at the ends of thestroke of the lever m. For example, considering the line A A, Figs. 4and 5, as the central position of the parts (the points 0 to 10 on theline It R indicating the positions of the pin 0" corresponding to thesimilarly-numbered positions of the pin 9 on the circle G G) it will beseen that point 10 on line R R is no farther removed from line A A thanis point O thereon. This interpreted means that during one-tenth of thecycle the pin 1 has no lateral. motion, and by varying the proportionsof the parts there may even he a negative motion at such timethat is tosay, a secondary orsupplemental approach of the pin r toward the line AA at the ends of the stroke. The presentdevice is so proportioned thatduring three-fifths of a cycle the lateral motion of the pin 0" isconfined to one-sixth The motion of the pin 1" is transmitted in asomewhat-modified form to the block .9 by means of the connecting-rod g.

It is not essential that the part 8 move in a rectilinear path, as mypresent device is well adapted to operate a part having a curvilinearpath, as shown in a companion application for Letters Patent of theUnited States for steamengines filed by me on the 26th day of July,

1901, Serial No. 69,801.

It is evident that means other than those shown may be employed to causethe rocking of the arm d.

What I claim as new, and desire to secure by Letters Patent, is

1. In a reducing mechanism, the combination of a pivoted guide, a leversliding therein, a rock-shaft and an arm fixed to said rockshaft andpivotally connected to said lever.

2. In a reducing mechanism, the combination of a rock-shaft having afixed axis, an

other extremity to a driven part of the mechanism in combination with aguide wherein said bar is slidingly mounted, said guide being revoluhleupon a fixed axis.

5. In a reducing mechanism, the combination of ,a bar or lever pivotallyand slidingly supported between its extremities, said bar or lever beingconnected at one end to a driven part of the device, a rocking armpivotally connected to the other end of said bar or lever, a rock-shaftfor driving said rocking arm, a second arm for driving said rockshaft, acrank, and connections between said crank and said second arm wherebythe rotation of said crank is transmitted to said second arm.

6. In a reducing mechanism, the combination of a crank, a rod connectedthereto, a rock-shaft, an arm keyed to said shaft and pivoted to saidrod, a second arm keyed to said shaft, a bar or lever pivoted to saidsecond arm, a guide wherein said bar or lever is slidingly mounted, saidguide having a fixed pivot, and a reciprocating driven member connectedto said bar or lever.

7. In a reducing mechanism, the combination of a driven reciprocatingmember, a rod connected thereto, a bar or lever connected to said rod, apivotally-supported guide for said bar or lever, a rock-shaft, an armkeyed to said shaft and pivoted to said bar or lever, and means foroperating said'rock-shaft.

8. In a reducing mechanism the combination of a sliding block, means forguiding said block, a connecting-rod pivoted to said block,a bar orlever pivoted to said rod, a guide wherein said bar or lever isslidingly mounted, said guide being pivoted on a fixed axis, arockshaft, an arm keyed to said shaft and pivoted to said bar or lever,and means for operating said rock-shaft.

'9. In a reducing mechanism, the combination of a reciprocating block,guides for said block, a bar or lever, a rod connecting said bar orlever to said block,a pivoted guide wherein said bar or lever isslidingly mounted, an arm pivoted to said bar or lever, a rockshaftkeyed to said arm, a second arm keyed to said rock-shaft, a crank and aconnectingrod joining said crank to said second arm for operating thelatter.

WALTER SABIN MCKINNEY.

W'itnesses:

ARTHUR M. Cox, CHARLES LFIIERRICK.

